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introduction：1：VVVF is Variable Voltage and Variable Frequency rind，It means changing the voltage and changing the frequency，That is what people call variable voltage frequency conversion。 2：CVCF is Constant Voltage and Constant Frequency rind，It means constant voltage、Constant frequency，Thats what people call constant voltage constant frequency。
2018-11-28 Reading quantity 271
introduction：How to clearly grasp the operating state of the dam，It is necessary to use the Internet of Things system for dam monitoring and early warning，Ensure dam safety，To ensure the safety of peoples lives and property，Give full play to the project benefits。Traditional dam monitoring systems are affected by the climate、circumstances、Safety and other factors，Not in time、Accurate understanding of dam safety data。Automated deformation monitoring systems not only overcome these factors，More all-weather、Real-time monitoring，Ensure dam safety。
2018-11-27 Reading quantity 308
introduction：The following is a brief introduction to the knowledge of the relay symbol by the pressure relay manufacturer！
2018-11-27 Reading quantity 316
introduction：When the coil is powered off，The electromagnetic attraction disappears，The armature is released under the action of a release spring，Restore the contact，Normally open contact disconnect，Normally closed contact is closed。The working principle of a DC contactor is somewhat similar to that of a temperature switch。
2018-11-27 Reading quantity 423
introduction：The speed of the rotor of the three-phase asynchronous motor is lower than that of the rotating magnetic field，Due to the relative motion between the rotor winding and the magnetic field, electromotive force and current are generated，And interact with the magnetic field to produce electromagnetic torque，Realize energy conversion。
2018-11-27 Reading quantity 238
introduction：Delta inverter advantages：Energy conservation Inverter energy saving is mainly manifested in the fan、The application of the pump。In order to ensure the reliability of production，All kinds of production machinery in the design with power drive，There is a certain amount of surplus。When the motor cannot run at full load，In addition to meeting the power drive requirements，The excess torque increases the consumption of active power，Resulting in a waste of electrical energy。Air blower、The traditional speed regulation method for pumps and other equipment is to adjust the inlet or outlet baffle、Valve opening to adjust the amount of air and water，Its input power is large，And a lot of energy is consumed in the baffle、Valve closure process。When using frequency conversion speed regulation，If traffic requirements are reduced，The requirements can be met by reducing the speed of the pump or fan。
2018-11-27 Reading quantity 1025
introduction：TIMKENDeep groove ball bearing has simple structure，Easy to use and maintain。Mainly used to bear radial loads、It can also withstand a certain axial load，When the radial clearance of the bearing increases，It has the properties of angular contact ball bearings，Can withstand large axial load。The friction coefficient of this kind of bearing is small，Limit speed height，Varied in size range and form。
2018-11-26 Reading quantity 538
introduction：Ac motor speed regulation method： one、Variable pole logarithm speed regulation method：The stator pole number of cage motor can be changed by changing the red connection mode of stator windings to achieve speed regulation。 two、Variable frequency speed regulation method：Use frequency converter to change the frequency of motor stator power supply，Thus changing the speed regulation method of synchronous speed。
2018-11-26 Reading quantity 242
introduction：High temperature melt pressure sensor is often used to measure the pressure of high temperature melt in the mold cavity，General output millivolt signal。Both the high temperature melt pressure sensor and the measured object are in a disturbed environment，Inevitably there will be outside interference。In particular, piezoelectric pressure sensors and capacitive pressure sensors are easily interfered with。So what are the anti-interference measures of the high temperature melt pressure sensor？
2018-11-26 Reading quantity 269
introduction：HRBBearing start time，The initial temperature rise is equal to high，After reaching the positive value，Gradually reduce and reach a stable temperature，This is because the inner ring conflict heat is higher than the outer ring when the bearing starts running，The inner ring expands faster than the outer ring，Why the running clearance is smaller than the residual clearance。Resume operation，Due to heat dissipation、The temperature of the outer ring is relatively stable，The running clearance is also stable，No number of conditions of bearing operation at the beginning of the control5min～6minIt can be inferred if there is an unusual temperature rise。
2018-11-23 Reading quantity 498
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